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7=a+a+a√2
7=3a√2
7√2/2=3a /:3
a=21√2/2
Obw=3*a
Obw=21√2/2*a
Obw=21√2/2a
P=7
7=a*a/2√2
7=a²/2√2
7√2/2=a² /:a
ob=a+a+b
ob=21√2/2*a
ob=21√2/2a